/*
 * Numer identyfikacji podatkowej ( NIP ) is the way tax identification used in Poland for companies
 */
$.validator.addMethod("nipPL", function (value) {
    "use strict";

    value = value.replace(/[^0-9]/g, "");

    if (value.length !== 10) {
        return false;
    }

    var arrSteps = [6, 5, 7, 2, 3, 4, 5, 6, 7];
    var intSum = 0;
    for (var i = 0; i < 9; i++) {
        intSum += arrSteps[i] * value[i];
    }
    var int2 = intSum % 11;
    var intControlNr = ( int2 === 10 ) ? 0 : int2;

    return ( intControlNr === parseInt(value[9], 10) );
}, "Please specify a valid NIP number.");
